Kamouraska
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kamouraska clear sky chart from 2005-11-06 to 2026-07-01.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	16% 10% 3 8% 5% 5% 5% 4 6% 7% 32%	137833
	Night	16% 12% 4 9% 6% 5% 5% 4 5% 6% 28%	134627
Transparency	Day	52% 4 14% 21% 9% 1	141281
	Night	57% 4 12% 19% 8% 1	139270
Seeing	Day	24% 10% 29% 24% 11% 3	17753
	Night	25% 7% 27% 29% 10% 1	25941

By Month

Percentage Cloud Cover NE (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	14% 19% 5% 11% 5% 5% 5% 4 6% 6% 19%	4337
	11th to 20th	Day	10% 15% 7% 13% 8% 6% 5% 4 5% 6% 21%	4650
	21st to end	Day	5% 7% 4 13% 7% 6% 7% 5% 7% 9% 31%	5124
February	1st to 10th	Day	8% 13% 4 10% 9% 7% 5% 5% 6% 6% 27%	1733
	11th to 20th	Day	11% 16% 6% 12% 7% 4 5% 3 5% 5% 25%	1942
	21st to end	Day	11% 10% 4 8% 6% 6% 6% 5% 6% 7% 30%	1730
March	1st to 10th	Day	18% 15% 4 9% 6% 4 5% 3 4 6% 26%	4576
	11th to 20th	Day	14% 15% 4 9% 6% 6% 5% 4 5% 6% 26%	4987
	21st to end	Day	15% 16% 5% 10% 4 4 3 3 4 5% 31%	5762
April	1st to 10th	Day	20% 12% 3 8% 5% 4 5% 4 4 6% 29%	2520
	11th to 20th	Day	18% 10% 3 7% 4 4 5% 3 5% 6% 37%	2670
	21st to end	Day	22% 9% 3 5% 4 4 4 3 5% 7% 34%	2730
May	1st to 10th	Day	19% 10% 3 8% 5% 4 5% 4 5% 6% 30%	7657
	11th to 20th	Day	20% 8% 3 7% 5% 4 4 3 5% 7% 34%	8239
	21st to end	Day	18% 8% 3 7% 5% 5% 5% 5% 6% 7% 32%	9716
June	1st to 10th	Day	19% 7% 3 7% 6% 5% 5% 4 6% 7% 32%	3150
	11th to 20th	Day	17% 6% 2 6% 4 4 5% 4 7% 8% 36%	3150
	21st to end	Day	19% 8% 3 8% 6% 4 5% 4 6% 7% 30%	3150
July	1st to 10th	Day	15% 6% 3 8% 5% 5% 5% 5% 7% 9% 32%	6820
	11th to 20th	Day	13% 7% 3 7% 5% 6% 5% 5% 7% 9% 35%	6481
	21st to end	Day	10% 6% 2 5% 4 4 5% 4 7% 9% 45%	6926
August	1st to 10th	Day	13% 5% 2 6% 5% 5% 5% 5% 8% 10% 35%	4466
	11th to 20th	Day	14% 7% 2 7% 6% 5% 5% 4 6% 8% 36%	4175
	21st to end	Day	16% 6% 2 6% 3 4 4 3 6% 7% 42%	4647
September	1st to 10th	Day	13% 5% 3 6% 4 4 4 4 6% 9% 43%	2370
	11th to 20th	Day	14% 5% 2 5% 3 3 3 3 4 6% 51%	2200
	21st to end	Day	17% 6% 2 6% 4 4 4 4 5% 8% 42%	2200
October	1st to 10th	Day	15% 7% 3 7% 5% 4 4 3 6% 8% 37%	2163
	11th to 20th	Day	20% 9% 3 7% 5% 4 5% 3 6% 7% 31%	1865
	21st to end	Day	25% 12% 3 7% 5% 3 3 4 5% 6% 26%	1980
November	1st to 10th	Day	18% 10% 4 8% 5% 5% 5% 4 5% 7% 31%	1851
	11th to 20th	Day	17% 12% 5% 10% 6% 4 4 4 6% 6% 24%	1756
	21st to end	Day	19% 17% 3 9% 5% 5% 6% 3 5% 4 24%	1519
December	1st to 10th	Day	15% 14% 5% 12% 7% 5% 4 3 4 6% 24%	2350
	11th to 20th	Day	18% 11% 3 8% 5% 5% 5% 4 6% 7% 28%	2688
	21st to end	Day	18% 13% 4 10% 5% 7% 6% 3 4 4 25%	3553
January	1st to 10th	Night	14% 19% 5% 12% 7% 5% 5% 4 5% 5% 18%	8559
	11th to 20th	Night	10% 17% 7% 16% 7% 5% 5% 3 5% 5% 18%	8235
	21st to end	Night	4 9% 5% 14% 7% 6% 7% 5% 7% 7% 29%	9057
February	1st to 10th	Night	9% 13% 5% 10% 8% 6% 5% 4 5% 6% 30%	2887
	11th to 20th	Night	12% 17% 5% 11% 7% 5% 5% 3 5% 5% 25%	2562
	21st to end	Night	13% 14% 5% 10% 5% 4 5% 3 5% 6% 31%	2076
March	1st to 10th	Night	19% 13% 4 10% 5% 5% 6% 3 4 5% 25%	5484
	11th to 20th	Night	14% 18% 5% 11% 6% 6% 5% 3 5% 5% 22%	5191
	21st to end	Night	20% 17% 4 7% 4 3 4 3 4 5% 30%	5407
April	1st to 10th	Night	22% 15% 3 8% 4 4 3 3 5% 4 29%	2100
	11th to 20th	Night	20% 11% 2 7% 5% 4 5% 3 5% 6% 31%	1898
	21st to end	Night	26% 8% 3 6% 4 4 5% 3 3 5% 32%	1890
May	1st to 10th	Night	22% 10% 3 7% 4 5% 5% 3 5% 6% 29%	5259
	11th to 20th	Night	24% 9% 3 7% 5% 4 4 3 5% 6% 29%	4646
	21st to end	Night	18% 7% 2 6% 4 4 5% 5% 6% 8% 35%	4491
June	1st to 10th	Night	19% 9% 3 8% 5% 5% 4 5% 5% 8% 29%	1470
	11th to 20th	Night	18% 7% 2 6% 4 4 5% 3 7% 8% 37%	1470
	21st to end	Night	22% 8% 3 9% 5% 4 4 4 5% 7% 28%	1470
July	1st to 10th	Night	13% 8% 2 7% 6% 5% 5% 4 7% 10% 33%	3160
	11th to 20th	Night	16% 7% 2 7% 5% 5% 5% 4 5% 8% 36%	3467
	21st to end	Night	11% 6% 2 6% 5% 4 5% 4 6% 9% 41%	3926
August	1st to 10th	Night	18% 6% 4 6% 5% 5% 5% 4 6% 7% 36%	2651
	11th to 20th	Night	14% 7% 3 10% 6% 6% 6% 5% 7% 9% 27%	2872
	21st to end	Night	16% 9% 3 7% 4 4 4 3 4 6% 40%	3248
September	1st to 10th	Night	15% 6% 2 6% 5% 5% 4 4 4 8% 40%	2029
	11th to 20th	Night	18% 7% 3 5% 4 4 4 4 5% 5% 41%	2200
	21st to end	Night	16% 8% 3 6% 4 4 4 2 4 5% 44%	2200
October	1st to 10th	Night	18% 10% 2 7% 4 3 4 3 4 5% 41%	2236
	11th to 20th	Night	24% 9% 3 6% 4 4 5% 3 5% 6% 30%	2532
	21st to end	Night	23% 11% 3 8% 5% 4 4 3 5% 6% 29%	2860
November	1st to 10th	Night	20% 12% 3 7% 5% 5% 4 4 5% 6% 29%	2667
	11th to 20th	Night	20% 12% 4 8% 5% 5% 4 3 5% 6% 27%	2861
	21st to end	Night	19% 15% 5% 10% 6% 5% 4 3 5% 5% 22%	3098
December	1st to 10th	Night	14% 17% 8% 12% 7% 6% 4 3 4 5% 19%	5060
	11th to 20th	Night	19% 12% 4 11% 7% 6% 5% 3 5% 6% 23%	5741
	21st to end	Night	17% 15% 4 11% 7% 7% 7% 3 4 5% 21%	7667

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	66% 4 11% 15% 4	4338
	11th to 20th	Day	65% 4 8% 16% 6% 1	4680
	21st to end	Day	50% 6% 13% 18% 13%	5124
February	1st to 10th	Day	57% 3 11% 18% 10% 2	1733
	11th to 20th	Day	61% 2 10% 17% 9% 1	1950
	21st to end	Day	53% 4 8% 23% 11% 2	1730
March	1st to 10th	Day	61% 2 11% 12% 11% 4	4579
	11th to 20th	Day	61% 3 13% 15% 8% 1	4987
	21st to end	Day	57% 2 6% 19% 12% 4	5762
April	1st to 10th	Day	58% 2 9% 17% 11% 3	2520
	11th to 20th	Day	50% 2 10% 24% 12% 2	2670
	21st to end	Day	52% 3 9% 20% 14% 2	2730
May	1st to 10th	Day	55% 3 10% 21% 10% 1	7669
	11th to 20th	Day	52% 3 12% 24% 8% 2	8243
	21st to end	Day	51% 4 13% 18% 13% 1	9717
June	1st to 10th	Day	50% 3 12% 22% 11% 1	3150
	11th to 20th	Day	46% 4 15% 24% 11% 1	3150
	21st to end	Day	53% 4 15% 19% 9% 1	3150
July	1st to 10th	Day	48% 5% 16% 24% 7%	6745
	11th to 20th	Day	44% 6% 22% 22% 4 1	6403
	21st to end	Day	37% 5% 20% 30% 8%	6728
August	1st to 10th	Day	42% 6% 22% 23% 7%	4452
	11th to 20th	Day	46% 5% 20% 23% 5%	4214
	21st to end	Day	42% 4 19% 22% 13%	4647
September	1st to 10th	Day	39% 3 18% 28% 12% 1	2370
	11th to 20th	Day	37% 3 17% 30% 13% 1	2200
	21st to end	Day	43% 3 14% 29% 11%	2200
October	1st to 10th	Day	53% 5% 12% 23% 7%	3527
	11th to 20th	Day	51% 3 18% 24% 4	3016
	21st to end	Day	51% 5% 16% 21% 7%	3180
November	1st to 10th	Day	55% 3 14% 22% 6% 1	1851
	11th to 20th	Day	60% 4 8% 21% 7%	1756
	21st to end	Day	64% 3 12% 15% 5%	1519
December	1st to 10th	Day	62% 4 14% 10% 10%	2350
	11th to 20th	Day	55% 7% 12% 17% 10%	2688
	21st to end	Day	60% 5% 12% 15% 6% 2	3553
January	1st to 10th	Night	69% 3 11% 14% 4	8559
	11th to 20th	Night	69% 3 9% 12% 7%	8280
	21st to end	Night	53% 4 10% 20% 14%	9057
February	1st to 10th	Night	55% 4 10% 20% 10% 1	2887
	11th to 20th	Night	62% 3 9% 16% 9% 1	2565
	21st to end	Night	56% 2 8% 22% 11% 1	2076
March	1st to 10th	Night	62% 3 9% 14% 12% 1	5494
	11th to 20th	Night	66% 3 11% 13% 7% 1	5192
	21st to end	Night	59% 1 5% 22% 11% 1	5407
April	1st to 10th	Night	61% 2 5% 16% 14% 3	2100
	11th to 20th	Night	56% 2 8% 20% 13% 1	1898
	21st to end	Night	57% 2 6% 21% 12% 1	1890
May	1st to 10th	Night	55% 4 10% 18% 11% 1	5265
	11th to 20th	Night	56% 3 10% 22% 8% 1	4647
	21st to end	Night	48% 4 12% 20% 14% 2	4492
June	1st to 10th	Night	54% 3 12% 21% 9% 1	1470
	11th to 20th	Night	46% 3 14% 21% 14% 2	1470
	21st to end	Night	55% 4 13% 18% 9%	1470
July	1st to 10th	Night	46% 6% 19% 25% 4	3125
	11th to 20th	Night	47% 5% 22% 22% 3	3423
	21st to end	Night	39% 6% 23% 25% 8%	3809
August	1st to 10th	Night	49% 5% 18% 23% 5%	2641
	11th to 20th	Night	52% 7% 19% 15% 7%	2899
	21st to end	Night	47% 3 15% 24% 11%	3248
September	1st to 10th	Night	44% 4 14% 27% 11% 1	2029
	11th to 20th	Night	46% 2 17% 25% 10% 1	2200
	21st to end	Night	44% 4 11% 28% 13%	2200
October	1st to 10th	Night	50% 3 12% 28% 7%	3652
	11th to 20th	Night	52% 5% 14% 25% 5%	4120
	21st to end	Night	50% 6% 17% 19% 7%	4610
November	1st to 10th	Night	58% 3 13% 20% 6% 1	2667
	11th to 20th	Night	59% 4 12% 18% 7%	2861
	21st to end	Night	65% 4 11% 14% 6%	3098
December	1st to 10th	Night	68% 4 10% 13% 5%	5060
	11th to 20th	Night	63% 4 8% 19% 6%	5742
	21st to end	Night	65% 4 10% 15% 5%	7667

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	23% 15% 38% 19% 4 2	220
	11th to 20th	Day	25% 16% 34% 18% 7% 1	220
	21st to end	Day	14% 17% 38% 19% 11% 2	242
February	1st to 10th	Day	18% 17% 33% 21% 8% 4	273
	11th to 20th	Day	20% 13% 37% 24% 6%	478
	21st to end	Day	20% 14% 36% 22% 7% 1	446
March	1st to 10th	Day	29% 14% 27% 21% 8% 1	540
	11th to 20th	Day	27% 11% 29% 20% 10% 3	540
	21st to end	Day	27% 13% 30% 18% 8% 3	594
April	1st to 10th	Day	31% 13% 30% 21% 5% 1	540
	11th to 20th	Day	32% 10% 29% 20% 8% 2	532
	21st to end	Day	27% 11% 33% 19% 8% 2	540
May	1st to 10th	Day	27% 11% 29% 22% 9% 3	543
	11th to 20th	Day	23% 9% 29% 25% 12% 2	572
	21st to end	Day	23% 9% 35% 23% 9% 1	845
June	1st to 10th	Day	26% 6% 29% 27% 10% 2	780
	11th to 20th	Day	23% 7% 28% 27% 13% 2	780
	21st to end	Day	24% 5% 26% 29% 14% 1	780
July	1st to 10th	Day	20% 7% 27% 30% 14% 2	720
	11th to 20th	Day	17% 7% 28% 31% 15% 3	577
	21st to end	Day	17% 5% 26% 30% 18% 3	576
August	1st to 10th	Day	17% 4 29% 29% 16% 6%	526
	11th to 20th	Day	18% 3 24% 30% 21% 4	519
	21st to end	Day	17% 9% 25% 26% 14% 8%	583
September	1st to 10th	Day	17% 8% 27% 28% 17% 4	530
	11th to 20th	Day	19% 9% 26% 27% 12% 6%	530
	21st to end	Day	20% 8% 23% 31% 13% 5%	530
October	1st to 10th	Day	20% 10% 28% 26% 12% 4	509
	11th to 20th	Day	31% 11% 24% 21% 12% 1	420
	21st to end	Day	34% 9% 28% 21% 6% 1	462
November	1st to 10th	Day	30% 13% 30% 21% 5% 1	425
	11th to 20th	Day	27% 13% 26% 24% 9% 1	430
	21st to end	Day	34% 15% 28% 19% 4	269
December	1st to 10th	Day	25% 14% 32% 18% 10% 1	220
	11th to 20th	Day	31% 15% 31% 19% 3	220
	21st to end	Day	26% 15% 36% 16% 6% 1	242
January	1st to 10th	Night	26% 10% 31% 25% 7% 1	902
	11th to 20th	Night	24% 9% 31% 26% 8% 1	840
	21st to end	Night	14% 9% 32% 33% 11% 1	924
February	1st to 10th	Night	17% 10% 36% 27% 10% 1	840
	11th to 20th	Night	23% 9% 31% 28% 8% 1	823
	21st to end	Night	22% 10% 29% 30% 8% 1	692
March	1st to 10th	Night	23% 8% 31% 30% 8%	840
	11th to 20th	Night	26% 10% 29% 26% 9% 1	840
	21st to end	Night	26% 7% 30% 26% 9% 1	924
April	1st to 10th	Night	33% 7% 27% 27% 6% 1	840
	11th to 20th	Night	27% 7% 28% 28% 9%	654
	21st to end	Night	31% 7% 26% 26% 9%	630
May	1st to 10th	Night	30% 4 27% 30% 7%	630
	11th to 20th	Night	27% 5% 22% 35% 11% 1	426
	21st to end	Night	26% 7% 28% 29% 9%	455
June	1st to 10th	Night	25% 3 23% 39% 10% 1	420
	11th to 20th	Night	22% 3 22% 37% 15% 1	420
	21st to end	Night	27% 4 26% 32% 12%	420
July	1st to 10th	Night	19% 4 28% 36% 11% 1	390
	11th to 20th	Night	15% 5% 23% 40% 16% 2	388
	21st to end	Night	16% 3 17% 46% 17% 1	438
August	1st to 10th	Night	16% 2 17% 45% 19% 2	437
	11th to 20th	Night	19% 2 20% 40% 18% 1	592
	21st to end	Night	18% 3 22% 38% 17% 2	672
September	1st to 10th	Night	19% 5% 27% 35% 14% 2	800
	11th to 20th	Night	22% 3 24% 32% 16% 2	800
	21st to end	Night	22% 5% 24% 35% 14% 1	800
October	1st to 10th	Night	24% 8% 26% 31% 10% 2	800
	11th to 20th	Night	31% 5% 26% 26% 12% 1	800
	21st to end	Night	30% 9% 26% 27% 8%	880
November	1st to 10th	Night	30% 11% 29% 23% 6% 1	820
	11th to 20th	Night	30% 11% 27% 23% 9% 1	909
	21st to end	Night	28% 11% 30% 23% 7% 1	950
December	1st to 10th	Night	30% 10% 28% 23% 7% 1	950
	11th to 20th	Night	28% 10% 31% 24% 5% 1	950
	21st to end	Night	28% 10% 29% 23% 9% 1	1045

Page generated at 2026-06-28 02:10:46. Version ac07

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